Definitions

1. noun

A collection of cryptographic keys or codes used for encryption and decryption

“The codebook contained the secret encryption keys used by the government agency.”

2. noun

A book containing musical notes or instructions for music performance

“The musician consulted her codebook to learn the correct notes for the new piece.”

3. noun

A reference book or guide used for coding or encoding data

“The data scientist used the codebook to decode the encrypted data set.”